Computer Science MCQ (Multiple Choice Questions)

a) Byte

b) Bit

c) Kilobyte

d) Megabyte

For Explanation Click Here:

A bit (binary digit) is the smallest unit of data storage, representing either a 0 or a 1. A byte consists of 8 bits, and larger units like kilobytes and megabytes are multiples of bytes.

a) Printer

b) Speaker

c) Keyboard

d) Monitor

For Explanation Click Here:

A keyboard is an input device used to enter data into a computer. A printer, speaker, and monitor are output devices, as they display or produce results based on the input.

a) O(n)

b) O(log n)

c) O(n^2)

d) O(1)

For Explanation Click Here:

Binary search works by repeatedly dividing the search interval in half. If the value of the search key is less than the value in the middle of the interval, the search continues in the lower half, or if greater, it continues in the upper half. This halving process results in a time complexity of O(log n).

a) Perform calculations and logical operations

b) Manage memory allocation

c) Control input and output devices

d) Store data temporarily

For Explanation Click Here:

The ALU is responsible for performing arithmetic and logical operations, such as addition, subtraction, AND, OR, etc. It is a critical component of the CPU (Central Processing Unit).

a) For loop

b) While loop

c) Do-While loop

d) Repeat-Until loop

For Explanation Click Here:

While “Repeat-Until” loops are present in some programming languages, they are not universally supported or considered a basic loop type. “For loop,” “While loop,” and “Do-While loop” are the standard types in most programming languages.

a) Queue

b) Stack

c) Array

d) Linked List

For Explanation Click Here:

A stack follows the Last In First Out (LIFO) principle. This means that the last element added to the stack is the first one to be removed. In contrast, a queue follows the FIFO (First In First Out) order.

a) To manage hardware resources

b) To execute programs

c) To provide security

d) All of the above

For Explanation Click Here:

An operating system (OS) is responsible for managing hardware resources, executing programs, and providing security mechanisms. It acts as an intermediary between the hardware and the software and ensures that resources are allocated efficiently.

a) Bubble Sort

b) Merge Sort

c) Quick Sort

d) Selection Sort

For Explanation Click Here:

Merge Sort has a time complexity of O(n log n) in the best, average, and worst cases. This makes it more efficient than Bubble Sort (O(n^2)), Selection Sort (O(n^2)), and Quick Sort, which has an

a) Integer

b) Float

c) Boolean

d) Character Array

For Explanation Click Here:

In programming, common valid data types are Integer, Float, and Boolean. A “Character Array” is not typically recognized as a fundamental data type. It might be used in specific programming languages (such as C or C++), but it is not one of the fundamental types like Integer or Boolean.